build(deps): bump github.com/grpc-ecosystem/grpc-gateway/v2

Bumps [github.com/grpc-ecosystem/grpc-gateway/v2](https://github.com/grpc-ecosystem/grpc-gateway) from 2.18.1 to 2.19.0.
- [Release notes](https://github.com/grpc-ecosystem/grpc-gateway/releases)
- [Changelog](https://github.com/grpc-ecosystem/grpc-gateway/blob/main/.goreleaser.yml)
- [Commits](https://github.com/grpc-ecosystem/grpc-gateway/compare/v2.18.1...v2.19.0)

---
updated-dependencies:
- dependency-name: github.com/grpc-ecosystem/grpc-gateway/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/grpc-ecosystem/grpc-gateway/v2/runtime/errors.go

@@ -137,7 +137,7 @@ func DefaultHTTPErrorHandler(ctx context.Context, mux *ServeMux, marshaler Marsh
 	doForwardTrailers := requestAcceptsTrailers(r)
 
 	if doForwardTrailers {
-		handleForwardResponseTrailerHeader(w, md)
+		handleForwardResponseTrailerHeader(w, mux, md)
 		w.Header().Set("Transfer-Encoding", "chunked")
 	}
 
@@ -152,7 +152,7 @@ func DefaultHTTPErrorHandler(ctx context.Context, mux *ServeMux, marshaler Marsh
 	}
 
 	if doForwardTrailers {
-		handleForwardResponseTrailer(w, md)
+		handleForwardResponseTrailer(w, mux, md)
 	}
 }
 

vendor/github.com/grpc-ecosystem/grpc-gateway/v2/runtime/handler.go

@@ -3,7 +3,6 @@ package runtime
 import (
 	"context"
 	"errors"
-	"fmt"
 	"io"
 	"net/http"
 	"net/textproto"
@@ -109,18 +108,20 @@ func handleForwardResponseServerMetadata(w http.ResponseWriter, mux *ServeMux, m
 	}
 }
 
-func handleForwardResponseTrailerHeader(w http.ResponseWriter, md ServerMetadata) {
+func handleForwardResponseTrailerHeader(w http.ResponseWriter, mux *ServeMux, md ServerMetadata) {
 	for k := range md.TrailerMD {
-		tKey := textproto.CanonicalMIMEHeaderKey(fmt.Sprintf("%s%s", MetadataTrailerPrefix, k))
-		w.Header().Add("Trailer", tKey)
+		if h, ok := mux.outgoingTrailerMatcher(k); ok {
+			w.Header().Add("Trailer", textproto.CanonicalMIMEHeaderKey(h))
+		}
 	}
 }
 
-func handleForwardResponseTrailer(w http.ResponseWriter, md ServerMetadata) {
+func handleForwardResponseTrailer(w http.ResponseWriter, mux *ServeMux, md ServerMetadata) {
 	for k, vs := range md.TrailerMD {
-		tKey := fmt.Sprintf("%s%s", MetadataTrailerPrefix, k)
-		for _, v := range vs {
-			w.Header().Add(tKey, v)
+		if h, ok := mux.outgoingTrailerMatcher(k); ok {
+			for _, v := range vs {
+				w.Header().Add(h, v)
+			}
 		}
 	}
 }
@@ -148,12 +149,10 @@ func ForwardResponseMessage(ctx context.Context, mux *ServeMux, marshaler Marsha
 	doForwardTrailers := requestAcceptsTrailers(req)
 
 	if doForwardTrailers {
-		handleForwardResponseTrailerHeader(w, md)
+		handleForwardResponseTrailerHeader(w, mux, md)
 		w.Header().Set("Transfer-Encoding", "chunked")
 	}
 
-	handleForwardResponseTrailerHeader(w, md)
-
 	contentType := marshaler.ContentType(resp)
 	w.Header().Set("Content-Type", contentType)
 
@@ -179,7 +178,7 @@ func ForwardResponseMessage(ctx context.Context, mux *ServeMux, marshaler Marsha
 	}
 
 	if doForwardTrailers {
-		handleForwardResponseTrailer(w, md)
+		handleForwardResponseTrailer(w, mux, md)
 	}
 }
 

vendor/github.com/grpc-ecosystem/grpc-gateway/v2/runtime/mux.go

@@ -57,6 +57,7 @@ type ServeMux struct {
 	marshalers                marshalerRegistry
 	incomingHeaderMatcher     HeaderMatcherFunc
 	outgoingHeaderMatcher     HeaderMatcherFunc
+	outgoingTrailerMatcher    HeaderMatcherFunc
 	metadataAnnotators        []func(context.Context, *http.Request) metadata.MD
 	errorHandler              ErrorHandlerFunc
 	streamErrorHandler        StreamErrorHandlerFunc
@@ -114,10 +115,18 @@ func DefaultHeaderMatcher(key string) (string, bool) {
 	return "", false
 }
 
+func defaultOutgoingHeaderMatcher(key string) (string, bool) {
+	return fmt.Sprintf("%s%s", MetadataHeaderPrefix, key), true
+}
+
+func defaultOutgoingTrailerMatcher(key string) (string, bool) {
+	return fmt.Sprintf("%s%s", MetadataTrailerPrefix, key), true
+}
+
 // WithIncomingHeaderMatcher returns a ServeMuxOption representing a headerMatcher for incoming request to gateway.
 //
 // This matcher will be called with each header in http.Request. If matcher returns true, that header will be
-// passed to gRPC context. To transform the header before passing to gRPC context, matcher should return modified header.
+// passed to gRPC context. To transform the header before passing to gRPC context, matcher should return the modified header.
 func WithIncomingHeaderMatcher(fn HeaderMatcherFunc) ServeMuxOption {
 	for _, header := range fn.matchedMalformedHeaders() {
 		grpclog.Warningf("The configured forwarding filter would allow %q to be sent to the gRPC server, which will likely cause errors. See https://github.com/grpc/grpc-go/pull/4803#issuecomment-986093310 for more information.", header)
@@ -147,13 +156,24 @@ func (fn HeaderMatcherFunc) matchedMalformedHeaders() []string {
 //
 // This matcher will be called with each header in response header metadata. If matcher returns true, that header will be
 // passed to http response returned from gateway. To transform the header before passing to response,
-// matcher should return modified header.
+// matcher should return the modified header.
 func WithOutgoingHeaderMatcher(fn HeaderMatcherFunc) ServeMuxOption {
 	return func(mux *ServeMux) {
 		mux.outgoingHeaderMatcher = fn
 	}
 }
 
+// WithOutgoingTrailerMatcher returns a ServeMuxOption representing a headerMatcher for outgoing response from gateway.
+//
+// This matcher will be called with each header in response trailer metadata. If matcher returns true, that header will be
+// passed to http response returned from gateway. To transform the header before passing to response,
+// matcher should return the modified header.
+func WithOutgoingTrailerMatcher(fn HeaderMatcherFunc) ServeMuxOption {
+	return func(mux *ServeMux) {
+		mux.outgoingTrailerMatcher = fn
+	}
+}
+
 // WithMetadata returns a ServeMuxOption for passing metadata to a gRPC context.
 //
 // This can be used by services that need to read from http.Request and modify gRPC context. A common use case
@@ -273,11 +293,11 @@ func NewServeMux(opts ...ServeMuxOption) *ServeMux {
 	if serveMux.incomingHeaderMatcher == nil {
 		serveMux.incomingHeaderMatcher = DefaultHeaderMatcher
 	}
-
 	if serveMux.outgoingHeaderMatcher == nil {
-		serveMux.outgoingHeaderMatcher = func(key string) (string, bool) {
-			return fmt.Sprintf("%s%s", MetadataHeaderPrefix, key), true
-		}
+		serveMux.outgoingHeaderMatcher = defaultOutgoingHeaderMatcher
+	}
+	if serveMux.outgoingTrailerMatcher == nil {
+		serveMux.outgoingTrailerMatcher = defaultOutgoingTrailerMatcher
 	}
 
 	return serveMux